this post was submitted on 04 Jul 2023
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I expect it is federation outbound activity growing in memory usage, it's all held in RAM for every post/comment/like going out to subscribed servers. !lemmyperformance@lemmy.ml is a community for the focus on scaling Lemmy.
Lemmy also buffers failed posts/votes in memory, such as if there's server issues like Lemmy.world and Lemmy.ml are having, to retry later.
Couple that with the server having to deal with an exponentially increasing amount of servers to federate with (since our Federation model currently links every server with every other server in a worst-case scenario), and that's probably doing bad things to the performance.